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Trash star 11 EP

HD 83100

RA 144.0774° · Dec 8.7960° · star

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Score breakdown

· 3 badges
11 pts · Trash
Trash 15 pts → Common
  • White A-type star +5
  • Star +3
  • On the zodiac +3
Total score 11

4 more points to reach Common.

Badges

  • Star · +3
  • On the zodiac · +3
  • White A-type star · +5

Trivia

Hard to believe

  • True brightness. It pours out about 1.8 million times as much light as the Sun. It only looks ordinary because it is so far away.

What it actually is

  • Spectral class. Its spectrum reads A — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

Find it in the sky

  • How to spot it. At magnitude 9.2 you'll want a small backyard telescope, over in Leo.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around February — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out brilliant white (B−V 0.2) — hotter and whiter than the Sun, the colour of Sirius or Vega.
  • Why no green stars. No star ever looks green: a surface hot enough to peak in green also floods out plenty of red and blue, and your eye blends the mixture back to white.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 8160 K, against the Sun's 5778 K.

Properties

absmag
-10.81
bv
0.2
constellation
Leo
luminosity
1836538.3433
mag
9.19
name
HD 83100
spect
A

Nearby objects

About HD 83100

HD 83100 is a trash star. It sits in the constellation Leo, shines at apparent magnitude 9.19 and has spectral type A.

Its spectrum reads A — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for HD 83100 in the constellation Leo. At apparent magnitude 9.19, a small backyard telescope will bring it into view.

Like any astronomical target, HD 83100 is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.

Why HD 83100 is a trash star

HD 83100 scores 11 points on Spacedle's rarity scale, which places it in the trash tier. Another 4 points would lift it into a rarer tier.

That score comes from 3 science badges — Star, On the zodiac and White A-type star — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.